Insulator.



V. P. ETTINGER.

INSULATOR.

APPLICATION FILED JAN. 20, l9l5.

Patented Feb. 29,1916.

M m My W W UNITED STATES PATENT OFFICE.

VICTOR I. ETTINGER, OF KANSAS CITY, MISSOURI.

msunaron Specification of Letters Patent. Patented Feb. 29, 1916.

Application filed January 20, 1915. Serial No. 3,334.

. my purpose to provide a supporting insulator for electric current transmission wires whereby the current carrying wire will be held to the insulator without the use of binding or tie wires as is now customary.

It is also my purpose to provide an insulator of the class described which will efi'ectively hold the current carrying wire without the necessity of insulating the latter or subjecting the same to great strain at the point of attachment and wherein the gripping of the current carrying wire will be even and uniform throughout the length of the insulator, thereby preventing splitting or parting of the wire at the insulator when sleet and ice cover the wire between the insulators.

A further object of my invention is the provision of a supporting insulator of the type set'forth which will-be constructed in such manner that-the wire may be strung around curves and at various angles without placing excessive strain on the wire at the point of attachment, or. subjecting the wire to sharp corners on the insulator.

A still further object of my invention is to provide an insulator for electric current transmission conductors whereby rainwater may drain away from the wire and clear of the cross arm of the pole carrying the in sulator, thereby tending to reduce current loss by afiordmg a more broken path to ground.

A still further object of my invention is to provide an insulator of anon'alinement groove type which can be. produced in. a three-piece mold without mold joints in the groove thereby eliminating the possibility of any rough points in the groove which will receive and old the wire. I

With the above and other objects in view, the invention oonsists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claims.

In the accompanying drawing: Figure 1 is a top plan view of an insulator constructed in accordance with the present invention. Fig. 2 is a view in side elevation thereof. Fig. 3 is an end view. Fig. 4 is a transverse sectional view through the insulator. Fig. 5 is a longitudinal sectional View therethrough.

In the present instance, the insulator is or stem 1 and a head 2 formed integral with the body 1 at one end thereof and projecting laterally therefrom at diametrically opposite points. Formed in the body or stem 1 is a of the insulator and extending longitudinally thereof is a sinuous groove 5 designed to receive the transmission wire and having the end portions thereof curved-in the same direction and the central portion curved in the reverse direction and connecting the end portions whereby a tortuous or sinuous substantially T-form and comprises a body groove is formed. The lower or inner wall of this sinuous groove 5 is curved upwardly from the opposite ends of the groove as at 6 toward the center of the groove, while the central point of the inner wall of the groove is slightly rounded as at 7 and merges into the inclined end portions 6, as clearly illustrated by the dotted lines in Fig. 2. Thus,

the groove is tortuous vertically as well as I horizontally.

The upperv surface of the head 2 adjacent "to the opposite ends thereof and at one side of the groove 5 is inclined downwardly as at 8 from the outer longitudinal e etfif the head toward the bottom wall 0 groove, while the central portion of the head between the downwardly inclined ortion 8 at the same side of the'groove is ormed to rovide a curved abutment wall 9 merging Into the downwardly inclined portions 8.

The inclinations of portions 8 are governed as follows: Consider a straight line as an axis parallel longitudinally to the head 2 and passing through the heart of the wire adjacent to the abutment wall 9. Points in the inclined surfaces 8 are in planes at right angles to this axis, the termini of radii (having their centers in the axis) which uniformly decrease in length as the surfaces 8 descend toward the bottom wall of groove 5. Formed on the upper surface of the head 2 adjacent to the ends thereof at the other side of the groove 5 are. wings 10, 10 respectivelyoverlying the adjacent portions of the groove and having the under surfaces thereof inclined downwardly toward the upper surface of the groove 5, this inclination'being governed as follows: All points in the under-surfaces of wings 10 are'in planes at right angles to the axis described, the termini of equal radii having their centers in the axis. The central portion of the head between the wings 10, is disposed in a plane slightly below'that of the abutment wall 9. lhe under surfaces of the wings 10 immediately above the straight, while the extremities of the lower wall of the groove drop at an angle greater than the portion-6 thereof as at 11 so that rain water and the like entering the groove may drain therefrom and clear the cross arm .and moved downwardly along the inc ined portions 8 into the groove 5. The wire upon entering the groove 5 assumes the shape of such .groove and the end portions of the wire within .the groove are drawn into contact with the flat portions of the under surfaces ofthe wings 10, incident to the weight and tension of the wire at opposite ends of the insulator; Owing to the shape of the groove, the wire is held therein with a umform pressure throughout the length of the Y oove 5 are preferably.

groove, thereby preventin mutilation of the wire incident to a particu ar portion of the groove biting the same.

The side walls of the groove 5 at the ends of the latter are preferably rounded off as at '12 so that the wire may be strung around curves and at various angles without encountering sharp points on the insulator.

I claim:

1. A supportin insulator comprising a body having a longitudinally extendin groove formed in one face thereof, and sai face, adjacent to the ends thereof, at one side of the groove, inclined downwardly to- 'ward the groove, and wings formed on said face at the ends thereof, upon the outer side of the groove, and overlying the groove and the inclined portions of the face and spaced apart from such inclined portions to form entrance ways to the groove.

2. A supporting insulator comprising a body having a longitudinally extending groove formed in one face thereof, and said face, adjacent to the ends thereof, at one side 'of the groove, inclined downwardly toward the groove, wings formed on said face at the ends thereof, upon the outer side of the groove, and overlying the-groove and the inclined portions of the face and spaced apart from'such inclined portions to form entrance ways to the groove, and an abut ment wall formed on said face between the downwardly inclined portions thereof upon the same side of the groove substantially as and for the purpose described.

3. A supporting insulator comprising a body having a longitudinally extending groove formed in one face thereof, and said face, adjacent to the ends thereof, at one side of the groove, inclined downwardly toward the groove, and wings formed on said face at the ends'thereof, upon the other side of the groove, and overlying the groove and the inclined portions of the face and spaced apart from the latter to form entrance ways to the groove, the bottom wall of said groove at the extremities thereof being inclined 1 downwardly at a sharp angle whereby rain water may drainrfrom the oove.

In testimonv whereof I a my signature in presence of two witnesses.

VICTOR P. ETTINGER. Witnesses: a A. C. Fnrsnnr, Jr.,

.W. Z. FLANEmz. 

